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Journal of the Geological Society; 1994; v. 151; issue.2; p. 343-347;
DOI: 10.1144/gsjgs.151.2.0343
© 1994 Geological Society of London

Article

Pan-African granulite-facies metamorphism in the Mozambique Belt of Tanzania: U-Pb zircon geochronology

S. MUHONGO1 & J.-L. LENOIR2

1 Department of Geology, University of Dar-es-Salaam, PO Box 15052, Dar es-Salaam, Tanzania
2 Département de Géologie et de Minéralogie, Musée Royal de l'Afrique Centrale, 3080 Tervuren, Belgique

Two new U-Pb concordia zircon ages are reported for granulite-facies rocks from the Mozambique Orogenic Belt in eastern Tanzania. These rocks are thought to have been generated during collision-related crustal thickening process and exhumed by deep erosion. A two-pyroxene granulite sample from the Pare Mountains has yielded a concordia upper intercept age of 645 ± 10 Ma, whereas a granulite-facies meta-anorthosite sample from the Uluguru Mountains has given an upper intercept age of 695 ± 4 Ma. Evidence for the involvement of older crustal material (pre-Late Proterozoic) was not found. These zircon data indicate crystallization during the peak of granulite-facies metamorphism during the Pan-African orogeny (c. 950 to c. 550 Ma) consistent with a subduction-collisional environment.




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